(Python Tutorials for Citizen Data Scientist)
Python Program to Check if a Number is Positive, Negative or Zero
In this example, you will learn to check whether a number entered by the user is positive, negative or zero. This problem is solved using if…elif…else and nested if…else statement.
Source Code: Using if…elif…else
num = float(input("Enter a number: "))
if num > 0:
print("Positive number")
elif num == 0:
print("Zero")
else:
print("Negative number")
Here, we have used the if...elif...else
statement. We can do the same thing using nested if
statements as follows.
Source Code: Using Nested if
num = float(input("Enter a number: "))
if num >= 0:
if num == 0:
print("Zero")
else:
print("Positive number")
else:
print("Negative number")
The output of both programs will be the same.
Output 1
Enter a number: 2 Positive number
Output 2
Enter a number: 0 Zero
A number is positive if it is greater than zero. We check this in the expression of if
. If it is False
, the number will either be zero or negative. This is also tested in subsequent expression.
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Python Examples for Beginners: Python Code to Check if a Number is Positive, Negative or Zero
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